Abstract
Addition of 100 μM choline chloride to the medium increased (by approx. 36%) both the length of the hyphal growth unit ( G a measure of mycelial branching) and the mean hyphal extension rate ( E) of Fusarium graminearum but did not increase the maximum rate of extension of the hyphae ( E max). The paramorphogen, edifenphos (Hinosan) reduced G and E without affecting specific growth rate (μ). However, when mycelia were treated with edifenphos plus choline, μ was reduced, G was increased by approx. 35%, but E and E max were not affected. The results suggest that the primary effect of edifenphos is inhibition of hyphal extension, whilst the primary effect of choline is inhibition of branch initiation.
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